Recent forecast guidance from multiple models points to partly to mostly cloudy skies with scattered showers in Guangzhou on September 16, limiting daytime heating and supporting market-implied odds clustered around 31–33 °C. Persistent monsoon moisture and light steering winds favor widespread cloud cover that reduces solar insolation, keeping maximum temperatures near or slightly below the late-summer climatological average of 31.9 °C. Ensemble spreads remain modest but reflect typical uncertainty in afternoon convective timing, which could allow brief clearing and a push toward 34 °C or hold the peak at 31 °C depending on the exact rain shield position. Updated model runs and official Chinese Meteorological Administration guidance over the next 48 hours will provide the clearest signal ahead of market resolution.